同学你好，该知识点来自沪江网校《英语零基础直达大学六级【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
这里应该用occured to

occur to （观念或想法 ) 被想到；出现在头脑中
It didn't occur to him that his wife was having an affair.
他没有想到自己的妻子有婚外情。
It didn't occur to her to ask for help.
她没想到请别人帮忙。

It suddenly occurred to me to visit my teacher. 我突然想到去拜访老师。

而happen to表示“发生到……”，在这里意思是不通顺的，比如
I want to know what happened to Norman.
我想知道诺曼怎么了。
It's the best thing that ever happened to me.
这是我所遇到的最好的事情了。

祝同学学习进步~